Speaker
Description
The discovery of strongly correlated electronic states in magic-angle twisted bilayer graphene has stimulated interest in using moiré potentials to explore interacting quantum systems. Carbon nanotubes on epitaxial boron nitride offer a one-dimensional setting for investigating this physics. Conductance measurements performed by our collaborators at the University of Utah reveal variations in peak spacing that reflect the charging and shell-filling behavior of the nanotube. Here, I present a theoretical model that predicts a shell-filling pattern broadly consistent with the measured conductance-peak positions. Within this model, agreement with experiment requires a small difference between the electron and hole charging energies. By fitting successive windows of approximately 50 peaks, we track how the model parameters vary with chemical potential. Notably, our results allow us to distinguish conductance resonances associated with electron addition from those associated with hole removal. More broadly, they highlight the importance of electron–hole charging asymmetry in understanding the shell-filling behavior of carbon nanotube quantum dots subject to a periodic potential.
